<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>计算器</title>
    <link rel="stylesheet" href="css/counter.css">
    <script src="js/jquery.js"></script>
    <script src="js/counter.js"></script>
</head>
<body>
<!--计算器外边框-->
<div class="container">

    <!--显示屏-->
    <div class="top">
        <div id="screen"></div>
    </div>

    <!--按键区域总容器-->
    <div class="center">
        <!--按键框-->
        <div class="btn">
            <button  type="button" value="1">1</button>
        </div>
        <div class="btn">
            <button  type="button" value="2">2</button>
        </div>
        <div class="btn">
            <button  type="button" value="3">3</button>
        </div>
        <div class="btn">
            <button  type="button" value="+">+</button>
        </div>
        <div class="btn">
            <button type="button" value="4">4</button>
        </div>
        <div class="btn">
            <button type="button" value="5">5</button>
        </div>
        <div class="btn">
            <button type="button" value="6">6</button>
        </div>
        <div class="btn">
            <button type="button" value="-">-</button>
        </div>
        <div class="btn">
            <button type="button" value="7">7</button>
        </div>
        <div class="btn">
            <button type="button" value="8">8</button>
        </div>
        <div class="btn">
            <button type="button" value="9">9</button>
        </div>
        <div class="btn">
            <button type="button" value="*">*</button>
        </div>
        <div class="btn">
            <button type="button" value="0">0</button>
        </div>
        <div class="btn">
            <button type="button" value="C">C</button>
        </div>
        <div class="btn">
            <button type="button" value="=">=</button>
        </div>
        <div class="btn">
            <button type="button" value="/">/</button>
        </div>

    </div>

</div>

</body>
</html>